.head
  height: 2rem;
.header
  width: 100%;
  height: 2rem;
  position: fixed;
  left: 0;
  top: 0;
  background-color: #fff;
  border-bottom: 2px solid #ccc;
.header .go-back
  width: 2rem;
  height: 2rem;
  text-align: center;
  color: #ccc;
  font-size: 0.8rem;
  float: left;
  line-height: 2rem;
  margin-left: 1rem;
  position: absolute;
  left: 0;
  top: 0;
.header .header-cont
  width: 100%;
  text-align: center;
  line-height: 2rem;
  font-size: 1.2rem;
